country obtained from

• (no filter) 

  Australia (1) Belgium (1) Canada (1) Netherlands (8) Singapore (1) United Kingdom (2) United States (4)

graduation

• deg (16) 

  cables (1) ft (1) gon / grad (4) m (1) mil (6400) (2) yard (8)

fine reading

•  direct (analog) (10)
•  drum micrometer (1)
•  scale micrometer (4)
•  scale micrometer (double) (1)
•  vernier (double) (1)
•  vernier (single) (1)

Type of use

•  Military (2)
•  Survey (13)

Material

•  Brass (6)

image direction

• (no filter) 

  inverted (6) upright (9)

Brand

•  Keuffel and Esser (1)
•  Wild Heerbrugg (15)